feat(wallet-react-ui): PoC add external-wallet auth method

[brtkx]

Summary

Adds an external-wallet sign-in method to the kit: injected wallets via EIP-6963 auto-discovery plus an in-house WalletConnect QR step — own UI end to end, no Reown components, no runtime registry API. PoC scope.

Done & working

• Auth flow — 'external-wallet' in AuthMethod; SignUp gains "Continue with a wallet" → wallet-selection step.
• Wallet list — 6963-discovered + dev-configured connectors (zerodev row filtered out); click = plain wagmi connect, the wallet's own provider serves RPC afterwards (embedded wallet and provider.ts never involved).
• Wallet guide — walletGuide.ts: 10 wallets (name, rdns, inline SVG icon, mobile deep-link prefix, download URL). Rows currently open the vendor download page.
• WalletConnect step — kit creates wagmi's walletConnect({ showQrModal: false }) from new ZeroDevKitConfig.walletConnectProjectId (registered via the same _internal path wagmi's own connect() uses; reuses a dev-added WC connector if present); subscribes display_uri before connecting; QR rendered in-house with uqr.
• Plumbing — walletConnectProjectId flows kit config → kit store (same pattern as logo).
• Demo — method enabled, PoC Reown projectId, mainnet + arbitrum added.
• Deps — uqr@^0.1.3 (kit).

Still to do (not in this PR)

• undiscovered (not installed) wallets become connect-capable

How to test

1. pnpm --filter @zerodev/signer-demo dev → localhost:3000.
2. Injected: sign-in modal → Continue with a wallet → WalletConnect → Scan QR code in any wallet app → modal closes, dapp connected via the wallet's provider.

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Project	Deployment	Actions	Updated (UTC)
zerodev-signer-demo	Ready	Preview, Comment	Jul 20, 2026 2:40pm

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commit: 8e08cb8

[andrascodes]

I like this approach a lot. Or at least I definitely can't think of a better one.
It stays more or less out of the way of our Embedded Wallet flows. It gives us the same capability that for example Privy has and it looks great. The mobile connection is also a great plus. So nice job! I think you devised a great solution!